Comparison of Corneal Higher-Order Aberrations Induced by Myopic and Hyperopic LASIK

Kohnen, Thomas; Mahmoud, K.H.; Bühren, Jens

doi:10.1016/j.ophtha.2005.05.004

Cited by 110 publications

(79 citation statements)

References 24 publications

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“…26 Kohnen et al found an increase of 0.13 µm in spherical aberrations. 27 Vestergaard et al compared aberrations induced postoperatively following SMILE and FS-LASIK and found lower aberrations induced following SMILE. 10 Similar results were found by Gertnere et al 17 …”

Section: Discussionmentioning

confidence: 99%

Comparison of Visual and Refractive Outcomes Following Femtosecond Laser-Assisted LASIK With SMILE in Patients With Myopia or Myopic Astigmatism

Ganesh¹,

Gupta²

2014

J Refract Surg

186

147

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ASIK is the most popular refractive surgery for myopic laser correction to date. The use of femtosecond laser-assisted LASIK (FS-LASIK) offers the creation of more predictable flaps with regard to flap thickness, diameter, and hinge width. 1,2Even with high success rates, side effects such as increased postoperative dryness, reduced biomechanical corneal strength, induction of higher-order aberrations (HOAs), postoperative glare, halos, and flap-related complications remain. 3-5More recently developed is refractive lenticule extraction, which uses a femtosecond laser to create an intrastromal corneal lenticule (the removal of which alters the shape of the cornea), thereby correcting myopia. It encompasses two different techniques: femtosecond lenticule extraction (FLEX) and small-incision lenticule extraction (SMILE).SMILE is a more recent flapless subtype in which the lenticule is extracted through a small arcuate incision (2 to 4 mm). This allows for greater stability because most of the Bowman's layer remains intact.Studies have shown that SMILE is associated with lower topographic changes and less inflammation and keratocyte apopotosis than FS-LASIK, particularly for higher levels of correction of myopia. 6,7 Because the procedure is flapless, most flap-related complications are not observed with SMILE.The aim of the current study was to evaluate the efficacy and safety of SMILE compared with FS-LASIK. Our primary hypothesis (null hypothesis) states that SMILE is better or comparable to LASIK for correction of myopia in terms of refractive accuracy and quality of vision (ie, postoperative aberrations and contrast sensitivity). Primary outcome measures were refractive efficacy, predictability, and safety, postoperative contrast sensitivity wavefront aberrations, and tear film abnormalities. L ABSTRACT PURPOSE: To compare the visual and refractive outcomes of femtosecond laser-assisted LASIK with smallincision lenticule extraction (SMILE) in terms of visual acuity, contrast sensitivity, aberrations, and dry eye. METHODS:A single-center prospective randomized study in which patients diagnosed as having myopia presenting for refractive correction were allocated to either a LASIK or SMILE group. The primary outcome measures were refractive efficacy, predictability, and safety, postoperative contrast sensitivity, aberrations, and dry eye status. Patients were followed up at days 1 and 15 and 3 months; postoperative uncorrected visual acuity (UCVA), aberrations, dry eye, and contrast sensitivity were recorded and compared to preoperative data. Two postoperative subjective questionnaires were used to assess pain, pricking sensation, redness, glare, and overall patient satisfaction. RESULTS:At day 1 postoperatively, 48 (96%) of 50 eyes in the SMILE group achieved a UCVA of 20/20 compared with 46 (92%) of 50 eyes in the LASIK group. At day 15 postoperatively, contrast sensitivity was similar in the two groups (P = .15), but by 3 months, it was better in the SMILE group than the LASIK group at all spatial frequencies (...

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Section: Discussionmentioning

confidence: 99%

Comparison of Visual and Refractive Outcomes Following Femtosecond Laser-Assisted LASIK With SMILE in Patients With Myopia or Myopic Astigmatism

Ganesh¹,

Gupta²

2014

J Refract Surg

186

147

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“…Although significant haze has been carefully excluded, some extent of subtle loss of transparency after surgery could occur without notice by the clinician, being the reason why retinal straylight increases, although the sample size does not warrant enough power to detect significant differences. Following this reasoning, the increase in luminous distortion could be to some extent due to the changes within the "bulk of the cornea" in terms of transparency, while the remaining "most" disturbance effect will be due to the change in the optical profile of the cornea from prolate cornea (negative spherical aberration, partially compensating for the internal positive spherical aberration of the eye) to oblate cornea (positive spherical aberration adding to the internal) [22].…”

Section: Discussionmentioning

confidence: 99%

Retinal straylight and light distortion phenomena in normal and post-LASIK eyes

Cerviño

Villa-Collar

González-Meijóme

et al. 2011

Graefes Arch Clin Exp Ophthalmol

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“…In particular, the method seems to be a rigorous analysis accounting for any deviation from the attempted target for the wavefront aberration. The profiles etched onto the cornea and their optical influence greatly differ between myopic and hyperopic corrections 38 Although it is generally accepted and well known that the effective optical zone diameter is less than the intended optical zone diameter, the specific results in this study are possibly only relevant for patients operated with the actual specific excimer laser and software. In the event of wavefront-guided treatments, results may differ.…”

Section: Aspheric Optical Zones and The Effective Optical Zonementioning

confidence: 95%